Graphics
Fun Factor
Majesty
Realistic and varied environments
Role-Play Capable (IE: Food to eat, beds to sleep in, churches to go to, good/evil decisions and paths)
Item Creation
Quest system
Open World
NPC's with personalities
Skyrim's Weakness:
Open world that scales to your level, thus making every area virtually the "same" and also, "too easy".
Bugs. Lots and lots of bugs.
Dark Souls' Strengths:
Addictive Game-play
Huge number of varied armor/weapon sets
Open(ish) World, with consequences
DIRE consequences for death (That's a good thing? YES. Here's why: the fear that is created from this is what sells an entire franchise. Horror games.)
Auto-Save system keeps you honest
A mysterious story-line, that keeps you guessing and imagining
Bosses. BIG bosses.
Dark Souls' Weakness:
A VERY linear world. Quite literally there is a right way to go, and that's it.
Lack of closure in either ending. I know I JUST listed the "mysterious story" as a strength, but I feel the ending MUST deliver closure.
Area transition is non-existent. I can go from poison swamp to lava lake with a doorway. That kind of drastic change is unrealistic and reminds me I'm playing a video game.
If a game were released that had all of the strengths of both, and none of the weakness, it'd be perfect.
Opinions?